I only met the late Mark Cohen once. This was in 1999 at the NCS Reuben Weekend in San Antonio, and before I started doing work for MAD. Mark was a prominent collector of cartoon artwork, and had 9among other things) one of the largest collections of original MAD art on the planet. His collections toured around galleries, and he was a tireless advocate for the cartooning world. I wish I had gotten a chance to get to know him.